Abstract：External characteristic is an important index for inverter performance. It represent that the output of inverter by effects of the load. External characteristic of inverter which has excellent performance is always strong, and output voltage changes little when load increase from empty to full. Until now resonant controller is efficient method to improve external characteristic of inverter. But after using resonant controller in 400Hz medium frequency inverter, it will lead to phase frequency curve pass through -πby low frequency phase shift influence.Considering centre frequency of resonant controller is close to cut-off frequency of inverter, phase shift of resonant controller will cause inverter unstable by influence phase margin of system open-loop transfer function. This paper set up small signal modeling of three phase four bridge inverter working in full load, combines with principle of automatic control, analyze judgement of stability condition when phase frequency curve passes through -π, and offer design principle of resonant controller used in medium frequency inverter. The inverter gain excellent dynamic performance and steady state performance by using resonant controller design principle. Simulation and experiment results proved theoretical analysis is correct.
陈轶涵,龚春英,邓翔. 一种提高中频逆变器外特性的谐振控制器建模与带宽设计[J]. 电工技术学报, 2015, 30(3): 94-102.
Chen Yihan,Gong Chunying,Deng Xiang. Modeling and Bandwith Optimization Design of Resonant Controller for Improving External Characteristic of Medium Frequency Inverter. Transactions of China Electrotechnical Society, 2015, 30(3): 94-102.
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